Stage musicals: What are the most obscure ones that you really enjoy?

I'll start off with some of mine:

Bat Boy the Musical (based on a June 23, 1992 Weekly World News story about a half-boy, half-bat, dubbed "Bat Boy", who grew up living in a cave.)

Blondel the Rock Opera (The title character is a musician trying to score big with Richard the Lionheart, who goes off on one of the Crusades. He struggles to follow him, as does an assassin and a group of monks who sing all of their dialogue in the form of Gregorian chants. Hilarity ensues.)

Eating Raoul the Musical (A couple of "squares", in the late 1960s, want to raise money to open a restaurant. They decide to kill swingers for profit by hitting them on the head with a frying pan. They become involved with a partner, Raoul, their swarthy, sexy janitor, who helps them to dispose of the bodies. However, they soon feel trapped by Raoul and dispatch him too; he becomes the main course. Based upon the film.)